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<title>Query options</title>
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<h2 class="TITLE">Query Language</h2>
<p>The text search engine allows queries to be formed from arbitrary Boolean
expressions containing the keywords AND, OR, and NOT, and grouped with
parentheses. For example:</p>
<blockquote>
  <dl>
    <dt><strong><tt>information retrieval</tt></strong></dt>
    <dd>finds documents containing 'information' or 'retrieval'<br>
    <br>
    </dd>
    <dt><strong><tt>information or retrieval</tt></strong></dt>
    <dd>same as above<br>
    <br>
    </dd>
    <dt><strong><tt>information and retrieval</tt></strong></dt>
    <dd>finds documents containing both 'information' and 'retrieval'<br>
    <br>
    </dd>
    <dt><strong><tt>information not retrieval</tt></strong></dt>
    <dd>finds documents containing 'information' but not 'retrieval'<br>
    <br>
    </dd>
    <dt><strong><tt>(information not retrieval) and WAIS</tt></strong></dt>
    <dd>finds documents containing 'WAIS', plus 'information' but not
    'retrieval'<br>
    <br>
    </dd>
    <dt><strong><tt>web*</tt></strong></dt>
    <dd>finds documents containing words starting with 'web'<br>
    <br>
    </dd>
  </dl>
</blockquote>

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